linux-kernel - Re: [PATCH v2 09/14] nvme: Implement cross-controller reset completion

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Message-ID: <431d225b-266f-431c-b3a5-03e033a2f63d@suse.de>
Date: Tue, 3 Feb 2026 06:22:38 +0100
From: Hannes Reinecke <hare@...e.de>
To: Mohamed Khalfella <mkhalfella@...estorage.com>,
 Justin Tee <justin.tee@...adcom.com>,
 Naresh Gottumukkala <nareshgottumukkala83@...il.com>,
 Paul Ely <paul.ely@...adcom.com>, Chaitanya Kulkarni <kch@...dia.com>,
 Christoph Hellwig <hch@....de>, Jens Axboe <axboe@...nel.dk>,
 Keith Busch <kbusch@...nel.org>, Sagi Grimberg <sagi@...mberg.me>
Cc: Aaron Dailey <adailey@...estorage.com>,
 Randy Jennings <randyj@...estorage.com>,
 Dhaval Giani <dgiani@...estorage.com>, linux-nvme@...ts.infradead.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 09/14] nvme: Implement cross-controller reset
 completion

On 1/30/26 23:34, Mohamed Khalfella wrote:
> An nvme source controller that issues CCR command expects to receive an
> NVME_AER_NOTICE_CCR_COMPLETED when pending CCR succeeds or fails. Add
> sctrl->ccr_work to read NVME_LOG_CCR logpage and wakeup any thread
> waiting on CCR completion.
> 
> Signed-off-by: Mohamed Khalfella <mkhalfella@...estorage.com>
> ---
>   drivers/nvme/host/core.c | 49 +++++++++++++++++++++++++++++++++++++++-
>   drivers/nvme/host/nvme.h |  1 +
>   2 files changed, 49 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
> index 13e0775d56b4..0f90feb46369 100644
> --- a/drivers/nvme/host/core.c
> +++ b/drivers/nvme/host/core.c
> @@ -1901,7 +1901,8 @@ EXPORT_SYMBOL_GPL(nvme_set_queue_count);
>   
>   #define NVME_AEN_SUPPORTED \
>   	(NVME_AEN_CFG_NS_ATTR | NVME_AEN_CFG_FW_ACT | \
> -	 NVME_AEN_CFG_ANA_CHANGE | NVME_AEN_CFG_DISC_CHANGE)
> +	 NVME_AEN_CFG_ANA_CHANGE | NVME_AEN_CFG_CCR_COMPLETE | \
> +	 NVME_AEN_CFG_DISC_CHANGE)
>   
>   static void nvme_enable_aen(struct nvme_ctrl *ctrl)
>   {
> @@ -4866,6 +4867,47 @@ static void nvme_get_fw_slot_info(struct nvme_ctrl *ctrl)
>   	kfree(log);
>   }
>   
> +static void nvme_ccr_work(struct work_struct *work)
> +{
> +	struct nvme_ctrl *ctrl = container_of(work, struct nvme_ctrl, ccr_work);
> +	struct nvme_ccr_entry *ccr;
> +	struct nvme_ccr_log_entry *entry;
> +	struct nvme_ccr_log *log;
> +	unsigned long flags;
> +	int ret, i;
> +
> +	log = kmalloc(sizeof(*log), GFP_KERNEL);
> +	if (!log)
> +		return;
> +
> +	ret = nvme_get_log(ctrl, 0, NVME_LOG_CCR, 0x01,
> +			   0x00, log, sizeof(*log), 0);
> +	if (ret)
> +		goto out;
> +
> +	spin_lock_irqsave(&ctrl->lock, flags);
> +	for (i = 0; i < le16_to_cpu(log->ne); i++) {
> +		entry = &log->entries[i];
> +		if (entry->ccrs == NVME_CCR_STATUS_IN_PROGRESS)
> +			continue;
> +
> +		list_for_each_entry(ccr, &ctrl->ccr_list, list) {
> +			struct nvme_ctrl *ictrl = ccr->ictrl;
> +
> +			if (ictrl->cntlid != le16_to_cpu(entry->icid) ||
> +			    ictrl->ciu != entry->ciu)
> +				continue;
> +
> +			/* Complete matching entry */
> +			ccr->ccrs = entry->ccrs;
> +			complete(&ccr->complete);
> +		}
> +	}
> +	spin_unlock_irqrestore(&ctrl->lock, flags);
> +out:
> +	kfree(log);
> +}
> +
>   static void nvme_fw_act_work(struct work_struct *work)
>   {
>   	struct nvme_ctrl *ctrl = container_of(work,
> @@ -4942,6 +4984,9 @@ static bool nvme_handle_aen_notice(struct nvme_ctrl *ctrl, u32 result)
>   	case NVME_AER_NOTICE_DISC_CHANGED:
>   		ctrl->aen_result = result;
>   		break;
> +	case NVME_AER_NOTICE_CCR_COMPLETED:
> +		queue_work(nvme_wq, &ctrl->ccr_work);
> +		break;
>   	default:
>   		dev_warn(ctrl->device, "async event result %08x\n", result);
>   	}
> @@ -5131,6 +5176,7 @@ void nvme_stop_ctrl(struct nvme_ctrl *ctrl)
>   	nvme_stop_failfast_work(ctrl);
>   	flush_work(&ctrl->async_event_work);
>   	cancel_work_sync(&ctrl->fw_act_work);
> +	cancel_work_sync(&ctrl->ccr_work);
>   	if (ctrl->ops->stop_ctrl)
>   		ctrl->ops->stop_ctrl(ctrl);
>   }
> @@ -5254,6 +5300,7 @@ int nvme_init_ctrl(struct nvme_ctrl *ctrl, struct device *dev,
>   	ctrl->quirks = quirks;
>   	ctrl->numa_node = NUMA_NO_NODE;
>   	INIT_WORK(&ctrl->scan_work, nvme_scan_work);
> +	INIT_WORK(&ctrl->ccr_work, nvme_ccr_work);
>   	INIT_WORK(&ctrl->async_event_work, nvme_async_event_work);
>   	INIT_WORK(&ctrl->fw_act_work, nvme_fw_act_work);
>   	INIT_WORK(&ctrl->delete_work, nvme_delete_ctrl_work);
> diff --git a/drivers/nvme/host/nvme.h b/drivers/nvme/host/nvme.h
> index fa18f580d76a..a7f382e35821 100644
> --- a/drivers/nvme/host/nvme.h
> +++ b/drivers/nvme/host/nvme.h
> @@ -366,6 +366,7 @@ struct nvme_ctrl {
>   	struct nvme_effects_log *effects;
>   	struct xarray cels;
>   	struct work_struct scan_work;
> +	struct work_struct ccr_work;
>   	struct work_struct async_event_work;
>   	struct delayed_work ka_work;
>   	struct delayed_work failfast_work;

This confuses me. Why do we call 'complete()' but do not have a 
corresponding 'wait_for_completion()' call?

Please merge with the next patch to allow reviewers to have the full
picture.

Cheers,

Hannes
-- 
Dr. Hannes Reinecke                  Kernel Storage Architect
hare@...e.de                                +49 911 74053 688
SUSE Software Solutions GmbH, Frankenstr. 146, 90461 Nürnberg
HRB 36809 (AG Nürnberg), GF: I. Totev, A. McDonald, W. Knoblich